US 12,434,176 B2
Filter diaphragm for a horizontal plate and frame-type filter, such as a tower press
Mirva Mustakangas, Pirkkala (FI); Ismo Juvonen, Rauha (FI); Janne Kaipainen, Halsua (FI); Teemu Eloranta, Luumäki (FI); Mika Illi, Vantaa (FI); and Kari Vänttinen, Espoo (FI)
Assigned to Metso Finland Oy, Espoo (FI)
Appl. No. 17/792,850
Filed by Metso Outotec Finland Oy, Tampere (FI)
PCT Filed Apr. 17, 2020, PCT No. PCT/FI2020/050254
§ 371(c)(1), (2) Date Jul. 14, 2022,
PCT Pub. No. WO2021/209679, PCT Pub. Date Oct. 21, 2021.
Prior Publication US 2023/0043237 A1, Feb. 9, 2023
Int. Cl. B01D 25/28 (2006.01); B01D 25/164 (2006.01); B01D 25/21 (2006.01); B01D 35/14 (2006.01)
CPC B01D 25/285 (2013.01) [B01D 25/164 (2013.01); B01D 25/215 (2013.01); B01D 35/14 (2013.01); B01D 2201/34 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A filter diaphragm for a horizontal plate and frame-type filter including a filter plate and a plate frame, comprising:
a sheet like body having a flexible structure, the body having a filter plate-facing side and a plate frame-facing side opposite the filter plate-facing side;
a continuous seal bead on the filter plate-facing side of the body; and
an attachment bead on a plate frame-facing side of the body, opposite to the filter plate-facing side, the attachment bead for attaching the diaphragm to a correspondingly shaped groove formed on the plate frame,
wherein the seal bead delimits a planar central portion of the diaphragm on a lateral inside thereof, a lateral outside of the diaphragm being defined on a side of the seal bead opposite to the lateral inside,
wherein the seal bead comprises an inner seal lip on a lateral inside of the seal bead and an outer seal lip surrounding the inner seal lip on a lateral outside of the seal bead, wherein the inner seal lip and the outer seal lip are configured to engage the filter plate,
wherein the outer seal lip is elevated from the inner seal lip in a vertical direction perpendicular to a general plane defined by the diaphragm.